When you write your email address, replace the '@' part of your address with the gif file aat.gif, which you do by clicking on the Embedded Image edit button at the top of your editing space. This will give you code that looks like:

[ [Image:Example.jpg] ]

Replace 'Example.jpg', with 'aat.gif' and the '@' part of your email address will show up as an image, so that your email address cannot simply be copied from this website.